package com.fas.core.util;

import java.net.InetAddress;
import java.net.UnknownHostException;

import javax.servlet.http.HttpServletRequest;
/**
 * 
 * IP工具类
 *
 * @Copyright: Copyright (c) 2016 FAS 
 * @anthor yixiaoping<thinker1013@163.com>
 * @since 2016年1月23日 下午10:51:19
 * @version V1.0
 */
public class IPUtil {
        
        /**
         * 获取当前网络ip
         * 
         * @param request
         * @return
         */
        public static  String getIpAddr(HttpServletRequest request) {
                String ipAddress = request.getHeader("x-forwarded-for");
                if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                        ipAddress = request.getHeader("Proxy-Client-IP");
                }
                if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                        ipAddress = request.getHeader("WL-Proxy-Client-IP");
                }
                if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                        ipAddress = request.getRemoteAddr();
                        if (ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")) {
                                // 根据网卡取本机配置的IP
                                InetAddress inet = null;
                                try {
                                        inet = InetAddress.getLocalHost();
                                } catch (UnknownHostException e) {
                                        e.printStackTrace();
                                }
                                ipAddress = inet.getHostAddress();
                        }
                }
                // 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
                if (ipAddress != null && ipAddress.length() > 15) { // "***.***.***.***".length()
                                                                    // = 15
                        if (ipAddress.indexOf(",") > 0) {
                                ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
                        }
                }
                return ipAddress;
        }
}
